[PATCH] freetalk: fix build on gcc-10 (-fno-common)

[Sergei Trofimovich]

gcc-10 changed the default from -fcommon to fno-common:
  https://gcc.gnu.org/PR85678

As a result build fails as:

    ld: more.o:src/./more.h:15: multiple definition of `cin'; 
primitives.o:src/./more.h:15: first defined here
    ld: more.o:src/./more.h:14: multiple definition of `initial_settings'; 
primitives.o:src/./more.h:14: first defined here

The change moves variable definitions to .c files.
---
 src/more.c | 3 +++
 src/more.h | 4 ++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/more.c b/src/more.c
index 1e76450..d6ed7b0 100644
--- a/src/more.c
+++ b/src/more.c
@@ -33,6 +33,9 @@
 
 #include "more.h"
 
+struct termios initial_settings;
+FILE *cin;
+
 void
 gotsig(int sig)
 {
diff --git a/src/more.h b/src/more.h
index a0160a9..083e8f8 100644
--- a/src/more.h
+++ b/src/more.h
@@ -11,8 +11,8 @@
 #include <sys/stat.h>
 #include <string.h>
 
-struct termios initial_settings;
-FILE *cin;
+extern struct termios initial_settings;
+extern FILE *cin;
 
 void gotsig(int sig);
 void more(char* buffer);
-- 
2.36.0